Improvement in the manufacture of turpentine



UNITED STATES PATENT OFFICE,

A: H. EM-EHY, or EW Yemen Y.

IMPROVEMENT IN THE MANUFACTURE OF TURPENTINE, 8 0 0- Specificntion forming part of Letters Patent 110.493 dated August 8, 1865.

in such a manner as to produce a large amount of oil of turpentine and rosin before destructive distillation of the wood commences, wherev by the oilof turpentineand rosin thusproduced are free from acid, tar, smoke, &c., without the use of applied steam 'or superheated steam.

,To enable others skilledin the art to make use of my invention, I will proceed to describe the precise process and operation.

Heretol'orein the distillation of pinewood without the use of steam or superheated steam the heat has been so regulated as toproduce oil of turpentine, tar, acid, smoke, &c., simultaneously. v

What I desire is to take out as much of the oil of turpentine and rosin as possible before destructive distillation commences, which produces the tar, creosote, acid, gas, 8m, as it is diificult to separate these products from the fine oil of turpentine, besides the quality of the .np air-tight, and gradually'raise up the heat sufficiently to drive 01f thebest of the oil of turpentine and the rosin without raising the heat sufliciently' to cause destructive distillation. The retort being closed up the pressure oi the vapors soon becomes sufficient to aid largely in the equalization of the heat throughoutthe retort. This pressure may be allowed to reach two or three atluospheres,aud the valveconnectiugu-ith the condenser he opened sufli ciently to keep up the desired pressure withontallowing it to get to be too great. A very convenient way of operating this valveis to have it weighted like an ordinary safety-valve and set the valve so as to give the pressure we want in theretort, when the excess of vapors v required for this purpose willbe rupidly passed through into the condenser. if no pressure is used in the retort except atmospheric, will require great care to regulate the heatso as to-- produce the distillation of the oil of turpentine and resin withoutalso foriuingsome ta'r, smoke,

and acid, which are very injurious tothe-firstnamed products.

What I claim, and desire to secure by. Letters Patent, is-

Distilling wood under more than zit-mes pheric pressure without'the applicatiotno' 

